import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { chmod, mkdir, readFile, rm, stat, writeFile } from 'node:fs/promises';
import { existsSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';
import { newFixture, type Fixture } from '../helpers/fixture.js';

vi.mock('node:fs', async (importOriginal) => {
    const original = await importOriginal<typeof import('node:fs')>();
    return { ...original, writeFileSync: vi.fn(original.writeFileSync) };
});

vi.mock('../../src/lib/server/integrations/rcon.js', () => ({
    rconGetPlayerCount: vi.fn(), rconStatusResult: vi.fn()
}));

let fixture: Fixture;
const servers = ['t5_zombie_theater_1', 't5_zombie_theater_2'];
const relPath = 'staged.gsc';
const before = Buffer.from('main(){ /* current live script */ }');
const after = Buffer.from('main(){ /* reviewed replacement */ }');
type Source = 'campaign' | 'beta';
const destination = (server = servers[0]) => join(fixture.t5, server, 'runtime/plutonium/storage/t5/raw/scripts/sp', relPath);

beforeEach(async () => {
    vi.resetModules();
    vi.resetAllMocks();
    const actualFs = await vi.importActual<typeof import('node:fs')>('node:fs');
    vi.mocked(writeFileSync).mockImplementation(actualFs.writeFileSync);
    vi.useFakeTimers({ toFake: ['Date'] });
    vi.setSystemTime(new Date('2026-09-27T15:00:00Z'));
    fixture = await newFixture(servers);

    vi.stubEnv('RCON_PASSWORD', 'test');
    vi.stubEnv('DEPLOYMENT_RESTART_CONCURRENCY', '1');
    const { seedServerRegistry } = await import('../../src/lib/server/fleet/servers.js');
    await seedServerRegistry();
    const { rconGetPlayerCount, rconStatusResult } = await import('../../src/lib/server/integrations/rcon.js');
    vi.mocked(rconGetPlayerCount).mockResolvedValue(0);
    vi.mocked(rconStatusResult).mockResolvedValue({
        ok: true, endpoint: { host: 'test', port: 28960 }, rawReply: '',
        status: { players: 0, map: 'zombie_theater', gametype: 'zom', roster: [] }
    });
});

afterEach(async () => {
    await fixture.cleanup();
    vi.unstubAllEnvs();
    vi.useRealTimers();
});

async function queueChange(source: Source, targets = [servers[0]]) {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { createScript, uploadNewVersion } = await import('../../src/lib/server/fleet/scripts.js');
    const { recordScript, getServerScript } = await import('../../src/lib/server/fleet/inventory.js');
    const original = createScript({ name: 'Staged script', kind: 'script', targetRelPath: relPath,
        scopeType: 'game', scopeValue: 't5', content: before });
    const replacement = uploadNewVersion(original.script.id, after);
    for (const server of targets) {
        await writeFile(destination(server), before);
        recordScript(server, relPath, original.version.id, original.version.sha256, before.length, 'fixture');
    }
    const inventory = getServerScript(targets[0], relPath);
    let sourceId: string;
    if (source === 'campaign') {
        db().prepare('UPDATE scripts SET current_version_id = ? WHERE id = ?').run(replacement.id, original.script.id);
        const { runDriftDeployment } = await import('../../src/lib/server/fleet/drift.js');
        const result = await runDriftDeployment({ servers: targets });
        expect(result.deploymentId).toBeTruthy();
        sourceId = result.deploymentId!;
    } else {
        const { openBeta } = await import('../../src/lib/server/fleet/beta.js');
        const result = await openBeta({ scripts: [{ scriptId: original.script.id, scriptVersionId: replacement.id }],
            servers: targets, waitForHealth: false, waitForMatch: false });
        sourceId = String(result.betaId);
    }
    return { sourceId, inventory, replacement };
}

// File-storage unit tests exercise activation directly. Native provisioning and
// safety suites cover admission, host delivery, player gates, and recovery.
async function tick(source: Source) {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { activateFiles } = await import('../helpers/staged-files.js');
    const sources = db().prepare('SELECT DISTINCT source_id FROM staged_file_changes WHERE source_kind=? AND state=\'pending\'').all(source) as { source_id: string }[];
    for (const row of sources) await activateFiles(source, row.source_id);
}

async function expectLiveUnchanged(inventory: Awaited<ReturnType<typeof queueChange>>['inventory'], server = servers[0]) {
    const { getServerScript } = await import('../../src/lib/server/fleet/inventory.js');
    expect(await readFile(destination(server))).toEqual(before);
    expect(getServerScript(server, relPath)).toEqual(inventory);
}

describe.each<Source>(['campaign', 'beta'])('%s staged file activation', (source) => {

    it('preserves existing file permissions when activating staged bytes', async () => {
        await queueChange(source);
        await chmod(destination(), 0o640);
        await tick(source);
        expect(await readFile(destination())).toEqual(after);
        expect((await stat(destination())).mode & 0o777).toBe(0o640);
    });

    it('applies the exact queued bytes even if artifact storage changes while waiting', async () => {
        const { replacement } = await queueChange(source);
        const { db } = await import('../../src/lib/server/db/index.js');
        db().prepare('UPDATE script_versions SET content = ? WHERE id = ?')
            .run(Buffer.from('changed after review'), replacement.id);
        await tick(source);
        expect(await readFile(destination())).toEqual(after);
    });

    it('keeps the queued payload across an application restart', async () => {
        const { inventory } = await queueChange(source);
        await expectLiveUnchanged(inventory);
        const { closeDb } = await import('../../src/lib/server/db/index.js');
        closeDb();
        vi.resetModules();
        await expectLiveUnchanged(inventory);
        await tick(source);
        expect(await readFile(destination())).toEqual(after);
    });
});